Разбор предложения (5 типов вопросов)they usually (to come) too see the dolphins

They usually come to see the dolphins.1 Do they usually come to see the dolphins?
2 Do they usually come to see the dolphins or the snakes?
3 They usually come to see the dolphins, don't they?
4 Who usually comes to see the dolphins?
5 What do they usually come to see?